Study On The Key Technologies And Methods For Seismic Experiment Of Jumbo Container Cranes

Quayside container crane is an important loading and unloading equipment of port terminals,with the large size of container transport ships,the container crane structure is also expanding to large-scale development.Earthquake as a devastating natural disaster often occurs in the port area,the damage caused by the large-scale container crane structure has been highly valued by experts and scholars at home and abroad,the study of seismic dynamics is an important way to explore the failure mechanism of container crane structure.Since the research of seismic dynamics,the method of seismic experiment is usually adopted,because of the difference of different experimental methods and key technical problems,the experimental results have greater uncertainty,which will bring influence on the seismic design of container crane structure:Based on the seismic engineering theory,the key techniques and methods for seismic experiment of container crane are studied by using the numerical simulation experiment and shaking table test,the main research contents are as follows:(1)Based on the four methods of Rayleigh damping coefficient calculation in engineering practice,and combined with the seismic response characteristics of container crane structure,an improved calculation method of damping coefficient is proposed.The frequency selection in the calculation of damping coefficient of container crane structure is determined,and the simulation and model tests under different damping coefficients are carried out with two different types of container crane structure,the results show that the improved damping coefficient calculation method is more suitable for the seismic simulation experiment of container crane structure.(2)Based on the structure dynamics and similar distortion theory,the stiffness distortion model of the container crane structure is established by the bending stiffness similarity method,and the prediction coefficient method is used to correct it.The relationship between the stiffness distortion coefficient and prediction coefficient is established by simulation,and the correctness of the curve is verified by the corresponding simulation experiment.The prediction of the prototype seismic response is realized,which solves the similar problem of the test model and prototype.(3)Through the investigation of the damage form of the container crane structure for various earthquake disasters and the influence of the main components on the overall structure seismic response,the simplified scheme of the seismic model of container crane structure is proposed.According to the boundary simulation,seismic input model and test model,the improvement method of container crane seismic experiment is proposed.Finally,the improved method is compared with the original method by simulation experiment,the results show that the improved method makes the model is feasible.(4)The seismic shaking table test scheme is studied and designed,and the related experiments are carried out.The shaking table seismic test of the container crane,the seismic response data of the structure key points and simulation results show consistency,it shows that the distortion model solves the similar problem of the container crane test model and prototype is feasible.Aiming at the problems about the key technologies of the simulation model and test model of container crane experiment,the proposed method and the research results provide theoretical support and method for the simulation of the container crane seismic simulation and the shaking table model test.The key technologies and the improvement of the experimental method are presented,which provides a new way for the container crane seismic experiment.